Animorphs
Animorphs.
Cool friends fighting aliens...more accurately, the pariah of a fascist civilization, minutes before being eaten alive in front of said "ccol friends" persuades and then bioengineers human child soldiers to facilitate an end to an ill-conceived and failing war now reduced to unilaterally exterminating a parasitic, physically disabled species, itself undergoing a violent civil rights movement on their own planet based on their self-recognized flaws, struggling to realize its place in a universe where godlike beings exist and decide not to offer remedy(rules of the god game) and spectate while the parasites overwhelm all vulnerable species in the known universe.
The child soldiers agree to resist the parasites, but at least a minority of them believe genocide is the wrong answer. After being physically and emotionally tortured, shot, repeatedly disemboweled and having their limbs hacked or bitten off by hosts of the parasitic species, however, all of the child soldiers begin taking violent, morally devastating actions that end their lives as they know them.
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Thanks so much! I just realized I can copy your comment, quote it and add the tags myself, which i was going to do and then saw your amended comment.
Much appreciated.
What a great series. I recommend pretty much everything else they worked on together and apart. Their other series are considered less complete in terms of world-building, but Remnants and Everworld both have some very interesting ideas and characters and more than a few holy shit moments.
Gone is a Grant-only venture, and pretty great as well, a whole lot of well-written dark and crazy.
Animorphs is such a rich text despite being an easy enough read that I've gone back for a reread occasionally and invariably been shocked by plot points I'd forgotten, grown closer to certain characters or just enjoyed vicarious Cinnabons depending on how I'd developed since the last go-through that it's worth a second look in the future at some point.